Srフエライト粉末を用いたボンド磁石の磁気特性に及ぼす成形条件の影響 The Influence of the Molding Condition on Magnetic Properties of Bonded Magnets with Sr-Ferrite Powders
The influences of the molding pressure (30, 50MPa) and temperature (100-250°C) on magnetic properties of bonded magnets with Sr-ferrite powders are investigated. The coercivity of the bonded magnets is almost constant 240kAm-1 at the molding temperature of about 200°C or more and independent of molding pressure. The reason why the coercivity of bonded magnets scarcely reduced during molding is due to quasi-isostatic pressure applied for Sr-ferrite powders by resin among the powders, considered by experiments using CIP and powder epoxy resin. The reduction of coercivity of Sr-ferrite powders is caused by mixing the compound. And the reduction of coercivity corresponds with mixing torque, which relates to shapes of Sr-ferrite powders.
粉体および粉末冶金 46(1), 72-76, 1999-01-15
Japan Society of Powder and Powder Metallurgy